Introducing GPT-5.6 series: Sol, Terra and Luna. Coming July 9 10am PT

Announcements
43

Extracted API notes

  • Models: gpt-5.6 → gpt-5.6-sol; also gpt-5.6-terra for cost/perf, gpt-5.6-luna for high-volume efficiency.

  • Reasoning effort: none | low | medium | high | xhigh | max; benchmark current setting and one level lower.

  • Pro mode: use reasoning.mode: "pro"; not a separate model slug. reasoning.effort stays independent. Higher token count, same rate.

  • Persisted reasoning: set reasoning.context to auto, all_turns, or current_turn.

  • Prompt cache: implicit still works; explicit mode via cache breakpoints / prompt_cache_options.mode: "explicit".

  • Cache TTL: replace prompt_cache_retention with prompt_cache_options.ttl.

  • Cache pricing: cache writes cost 1.25× uncached input; monitor cached_tokens and cache_write_tokens.

  • Programmatic Tool Calling: add programmatic_tool_calling; opt tools in with allowed_callers; handle program, function calls, and program_output.

  • Multi-agent beta: Responses API beta for parallel subagents and synthesis on separable complex tasks.

No “snapshot date” in model names.